OEM spring guide?

rothwem · 11-24-2015, 07:00 AM

There's an aftermarket spring guide, but if we don't know the lengths and rates of the OEM springs, how are we supposed to choose an aftermarket one?

Does anyone know if there's a chart out there with the rates and lengths of the OEM springs? I see that there's "D3" "D7" springs out there, what does that mean?

TheTallJS · 11-26-2015, 07:37 PM

D might be diameter (don't quote me I'm not sure), as Eibach has their spring part numbers as Length, Inner Diameter, and Rate. The forum has spring rates here http://www.e90post.com/forums/showthread.php?t=235797 .

Not sure about length, but different aftermarket ones will specify how much of a drop their lowering springs will do.

Stream · 11-26-2015, 10:49 PM

D is not diameter.
It,s just stiffness according to some bmw table. There are difference between 320i/335d like d3/d7

rothwem · 11-30-2015, 01:04 PM

Quote:

Originally Posted by Stream

D is not diameter.
It,s just stiffness according to some bmw table. There are difference between 320i/335d like d3/d7

I would love to get my hands on that table. Any idea where I could find it?

11-24-2015, 07:00 AM	#1
rothwem Major 476 Rep 1,191 Posts Drives: 2009 BMW 328i Wagon Join Date: Apr 2009 Location: Asheville, NC iTrader: (0) Garage List 2009 BMW 328i [0.00]	OEM spring guide? There's an aftermarket spring guide, but if we don't know the lengths and rates of the OEM springs, how are we supposed to choose an aftermarket one? Does anyone know if there's a chart out there with the rates and lengths of the OEM springs? I see that there's "D3" "D7" springs out there, what does that mean?
	Appreciate 0 Tweet Quote

11-26-2015, 07:37 PM	#2
TheTallJS Member 30 Rep 115 Posts Drives: Metallic Black 2006 325i Join Date: Sep 2009 Location: San Francisco iTrader: (0) Garage List 2006 BMW 325i [0.00]	D might be diameter (don't quote me I'm not sure), as Eibach has their spring part numbers as Length, Inner Diameter, and Rate. The forum has spring rates here http://www.e90post.com/forums/showthread.php?t=235797 . Not sure about length, but different aftermarket ones will specify how much of a drop their lowering springs will do. __________________ Fly the BMW. Last edited by TheTallJS; 11-26-2015 at 07:53 PM..
	Appreciate 0 Quote

11-26-2015, 10:49 PM	#3
Stream T667YM86 67 Rep 244 Posts Drives: E90 325i 05' Join Date: Mar 2013 Location: Russia, Surgut iTrader: (0)	D is not diameter. It,s just stiffness according to some bmw table. There are difference between 320i/335d like d3/d7
	Appreciate 0 Quote